欢迎进入Linux社区论坛,与200万技术人员互动交流 >>进入 最近要做毕业设计,以前用的数据库是oracle,基本上没出现过中文乱码的问题。可是毕业设计人在外地,带的笔记本比较垃圾,oracle根本带不起。一个eclipse加上一个火狐cpu就已经跑到90%了。所以最后决
欢迎进入Linux社区论坛,与200万技术人员互动交流 >>进入
最近要做毕业设计,以前用的数据库是oracle,基本上没出现过中文乱码的问题。可是毕业设计人在外地,带的笔记本比较垃圾,oracle根本带不起。一个eclipse加上一个火狐cpu就已经跑到90%了。所以最后决定用mysql数据库。前台用的是jsp,使用的编码格式是utf-8。
不过mysql的中文乱码让我纠结了许久。经过一番查询,最终解决了。
一:查看编程环境是否为utf-8
方法:右键项目名称-属性 找到文本文件编码 选择utf-8.
二:设置jsp页面的编码格式:
方法:contentType="text/html; charset=utf-8"
meta http-equiv="Content-Type" content="text/html; charset=utf-8"
三:设置request和response的编码格式:
方法:response.setContentType("text/html ;charset=utf-8");
request.setCharacterEncoding("utf-8");
四:编写过滤器
五:连接数据库的方式改为:jdbc:mysql://localhost/databasename?useUnicode=true&characterEncoding=UTF-8
经过以上5步,如果问题依然没有解决的话,则有可能是出现在mysql服务器上。
数据库方面
一:首先查看数据库字符集设置
方法:set character_set_client=utf8;
用这个方法可以看到几个字符集。
然后用以下命令修改
set character_set_client=utf8;
set character_set_connection=utf8;
set character_set_database=utf8;
set character_set_results=utf8;
set character_set_server=utf8;
当然也可以在mysql的安装目录下,一般在c盘中的 my.ini下修改凡是看到字符集有关的都修改成utf8
做到这步,基本上从数据库中取出的数据都是中文,但是还是有可能会出现问题,比如在用dos打开的时候,中文依然显示为乱码,而且不能在dos环境下用sql语句插入中文字符。
这时,要把set character_set_results=utf8; 改为 set character_set_results=gbk;
set character_set_client=utf8; 改为 set character_set_client=gbk;
这样,基本就能解决了。

InnoDBBufferPool reduces disk I/O by caching data and indexing pages, improving database performance. Its working principle includes: 1. Data reading: Read data from BufferPool; 2. Data writing: After modifying the data, write to BufferPool and refresh it to disk regularly; 3. Cache management: Use the LRU algorithm to manage cache pages; 4. Reading mechanism: Load adjacent data pages in advance. By sizing the BufferPool and using multiple instances, database performance can be optimized.

Compared with other programming languages, MySQL is mainly used to store and manage data, while other languages such as Python, Java, and C are used for logical processing and application development. MySQL is known for its high performance, scalability and cross-platform support, suitable for data management needs, while other languages have advantages in their respective fields such as data analytics, enterprise applications, and system programming.

MySQL is worth learning because it is a powerful open source database management system suitable for data storage, management and analysis. 1) MySQL is a relational database that uses SQL to operate data and is suitable for structured data management. 2) The SQL language is the key to interacting with MySQL and supports CRUD operations. 3) The working principle of MySQL includes client/server architecture, storage engine and query optimizer. 4) Basic usage includes creating databases and tables, and advanced usage involves joining tables using JOIN. 5) Common errors include syntax errors and permission issues, and debugging skills include checking syntax and using EXPLAIN commands. 6) Performance optimization involves the use of indexes, optimization of SQL statements and regular maintenance of databases.

MySQL is suitable for beginners to learn database skills. 1. Install MySQL server and client tools. 2. Understand basic SQL queries, such as SELECT. 3. Master data operations: create tables, insert, update, and delete data. 4. Learn advanced skills: subquery and window functions. 5. Debugging and optimization: Check syntax, use indexes, avoid SELECT*, and use LIMIT.

MySQL efficiently manages structured data through table structure and SQL query, and implements inter-table relationships through foreign keys. 1. Define the data format and type when creating a table. 2. Use foreign keys to establish relationships between tables. 3. Improve performance through indexing and query optimization. 4. Regularly backup and monitor databases to ensure data security and performance optimization.

MySQL is an open source relational database management system that is widely used in Web development. Its key features include: 1. Supports multiple storage engines, such as InnoDB and MyISAM, suitable for different scenarios; 2. Provides master-slave replication functions to facilitate load balancing and data backup; 3. Improve query efficiency through query optimization and index use.

SQL is used to interact with MySQL database to realize data addition, deletion, modification, inspection and database design. 1) SQL performs data operations through SELECT, INSERT, UPDATE, DELETE statements; 2) Use CREATE, ALTER, DROP statements for database design and management; 3) Complex queries and data analysis are implemented through SQL to improve business decision-making efficiency.

The basic operations of MySQL include creating databases, tables, and using SQL to perform CRUD operations on data. 1. Create a database: CREATEDATABASEmy_first_db; 2. Create a table: CREATETABLEbooks(idINTAUTO_INCREMENTPRIMARYKEY, titleVARCHAR(100)NOTNULL, authorVARCHAR(100)NOTNULL, published_yearINT); 3. Insert data: INSERTINTObooks(title, author, published_year)VA


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